Mate, I think you need to realise that your impression of her is based on things and memories from a long time ago, a form of escapism.
That time opportunity has passed, you’ve met another person, had a family lived a real life. ( these are filled with the grind of existence and the shine can fade) unlike your dream/ escapism. What I’m getting at is it won’t be bliss, you need to recognise this, really recognise this.
As if you do cross the Rubicon the your not going back to your current life your burning your bridges. I understand it must be terrible but it’s just a feeling you can control it and make it go away if you want.